Like Rob said, it's about showing respect to others.
Why post, release, read spoilers at all!? What ever happened to the element of surprise? Remember the days we used to tune in hoping for a surprise? We didn't tune in because the internet said OMG-Brock Lesnar...we tuned in looking for a continued reason to tune in.
Wrestling used to shock us, surprise us with out of the blue returns, face and heel turns...new guys coming in without vignettes(just come in and kick @ss). Today you know when a contract is up, when and where they sign...new feuds, etc. No element of surprise.
I remember as a kid riding my BMX to 7/11 to buy a pack of Baseball cards, looking at them one by one, looking to see who I got(surprise)...when I guess I coulda bought the entire collection at once and placed them on a shelf.
If I read a "Spoiler"...why watch it...I have already shelved it!?